Safety-lock.



J. WINN & A. FEINBERG.

SAFETY LOCK.

APPLICATION FILED MAY 26. 1914.

1,175,394. Patented Mar. 14, 1916.

t3 @TTE@ JOHN WINN, OF BROOKLINE, AND AARON FEINBERG, OF IDORCHESTER, MASSA- CHUSETTS.

SAFETY-LOCK.

Specification of Letters Patent.

Patented Mar. it, Llhlfi.

Application filed May as, 1914. Serial No. 849,975.

2' '0 all whom it may concern:

Be it known that we,-JorIN WINN, a citizen of the United States, and a resident of Brooklinc, county of Norfolk, Commonwealth of Massachusetts, and AARON FEIN- nnno, a citizen of the United States, and a resident of Dorohester, county of Suflolk, Commonwealth of Massachusetts, have in vented certain new and useful Improvements in Safety-Locks, of which the following is a specification accompanied by drawings.

This invention relates to safety looks, but more particularly to safety tongues or bolts for spring-latch locks, independent of the manner in which the .locks are normally operated or opened. In a spring-latch lock of almost any usual construction, having a slidable bolt provided with a beveled end, it is generally possible to force the look by inserting a piece of thin flexible material as celluloid or thin sheet metal between the door and door jamb, and against the beveled end of the bolt, thus forcing the bolt out of the lock strike, and permitting the door to be opened. There is usually more or less space or clearance between the edge of the door and the door jamb, protected to some degree by molding or a rabbet, but no great obstacle is ordinarily afforded against the insertion of such a piece of material as described.

The primary object. of this invention is to provide an improved construction of tongue or bolt and cooperating parts in the lock casing and lock strike, which will permit the bolt to freely enter the strike and be freely withdrawn therefrom by the lock mechanism of any suitable character, but the bolt cannot be forced by the insertion of a piece of thin flexible material between the door and door jamb. To these ends the bolt is provided. with a safety catch or projection at its beveled end which catches on the strike in case the lock is attempted to be forced in the manner described.

The invention is shown in its preferred forms in the accompanying drawings, in which Figure 1 is a longitudinal sectional view partly broken away of one form of the invention; Fig. 2 is a detail planview partly in horizontal section and partly broken away; Fig. 3 is a transverse sectional view of Fig. 2 on the line 3-3 looking in the direction of the arrows; Fin. 4 is a longitudinal sectional view of a modification of the invention; Fig. 5 is a detail plan view of Fig. 4, partly in horizontal section and partly broken away; and Fig. 6 is a transverse sectional view of Fig. 5 on the line 66 looking in the direction of the arrows.

Referring to the drawings, and more especially to the form of the invention shown in Figs. 1, 2 and 3, A represents a suitable lock casing adapted to be secured to the door B as by means of the usual plate C, and 1) represents the lock strike adapted to be secured to the door and) E. For the purposes of this invention, the cavity F behind the strike D should be undercut to permit the head of the bolt to enter.

The slidable tongue or bolt G is provided at one end H with suitable means adapted to cooperate with the lock mechanism which may be provided with a spring (not shown). 'The head J of the bolt has a beveled face'K and alocking toe or projection L forms a continuation of the face K. The upper surface of this projection L is curved at O and is otherwise substantially parallel to the beveled face K, so that the surfaces K and 0 have the same slope and bear substantially the same angular relation to the plane of the lock strike D. The ends of the projection L are connected to the body of the head J by means of the webs P, which in cline backwardly and form cam surfaces which cooperate with the strike D as the bolt is withdrawn by the lock mechanism. The

inner end of the bolt H is guided in the ways Q and R and the head J of the bolt is guided on the way S, so that as the bolt is withdrawn by the lock mechanism, the cam surfaces P force the bolt transversely and the locking projection L is released from the inwardly projecting portion T of the lock strike. If, however, a thin flexible piece of matrial, as a piece of celluloid, is at-. tempted to be thrust around the molding U and between the door and door jamb in front of the strike, the pressure of the end of said flexible material against the beveled face K of the bolt merely tends to force the projection L against the inwardly projecting portion T of the strike.

In Figs. t, 5 and 6, a modification of the invention is shown, in which the beveled head V of the bolt is provided with the projection W, but the cam surfaces are omitted and in order to guide the bolt in the of the look under the conditions described.

WVe claim and desire to obtain by Letters Patent the following:

1. In a spring-latch lock, the combination of a lock casing and a lock strike, a bolt in r the lock casing having a beveled end provided with a safety projection forming a continuation of the-beveled face of the end, the slope of the back of the said safety projection being substantially equal to the slope of the said beveled face of the end of the bolt, said safety projectionfreely entering the cavity of the lock strike, and guideways in the lock casing for guiding the bolt as it is withdrawn with sliding and transverse movement to release said projection from the strike, whereby forcing of the bolt Copies of this patent may be obtained for by the insertion of a piece of thin flexible material between the door and door jamb is prevented by the said safety projection.

2. In a spring-latch lock, the combination of a lock casing adapted to be secured to the door, and a lock strike having an undercut cavity in the door jamb, a bolt slidable in the lock casing and provided with a beveled end having a projection forming a safety catch or toe as a continuation of the beveled face of the bolt, the slope of the back of the said safety projection being substantially equal to the slope of the said beveled face of the end of the bolt, and guideways in the lock casing for moving the bolt transversely as it is drawn inwardly, to release the safety catch fro-1n the strike, whereby the forcing of the bolt by the insertion of a piece of thin flexible material between the door and door jamb is prevented by the said safety projection.

In testimony whereof We have signed this specification in the presence of two subscrib ing witnesses. 7 JOHN WIN N.

AARON FEINBERG.

Witnesses: I

MAY L. ,MCGOWAN, BEATRICE I. DEARBORN.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

